12th Class Biology MCQS Variation and Genetics

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Identical twins result from the fertilization of:
Two ova by one sperm
One ovum by the sperm
One ovum by the two sperms
Two ova by two sperms

A dichromate can perceive two primary colours but is unable to perceive the one whose opsins are missing due to
Transmutation
Metamorphosis
Mutation
Alteration

The outer layer of the blastocyst, which laterattaches tothe uterus , is:
Ammion
Inner cell mass
Trophoblast
Deciduas

A monochromat can perceive
Two colours
Yellow colours
Three colours
Only ane colour

Genes are located at specific loci on
Chromatids
Centromeres
Homologues
Chromosomes

The interaction between different genes occupying different loci is
Bombay phenotype
Linkage
Pleiotropy
Epistasis

Intelligence is also a case of polygenic inheritance which is strongly influenced by
Nature
Genes
Experience
Environment

ABO system has four different phenotypes which are distinct from each other on the basis of specific antigens on the surface of
Mitochondria
Centrioles
RBC
Gogli bodies

A woman can be bald only when she is
Heterozygous
Maleness
Homozygous recessive
Homozygous domunant

The protective coat which surrounds the embryo is known as:
Allantosis
Chorion
Chorio Allantoic
Amnion

Human skin colour is also a quantitative trait which is controlled by
1 – 3 gene pairs
3 – 6 gene pairs
Previous
None of these

A clear picture of the genetic basis of sex determination emerged after the discovery of
Y chromosomes
Sex chromosomes
X chromosomes
Autosomes

80% haemophiliacs suffer from haemophilia A due to abnormality of factor
IX
X
VIII
XI

ABO blood group system was discovered by
T.H.morgans
Karn Ladsteiner
Correns
Bernstein

The most important hormone in initiating and maintaning lacation after birth is:
Estrogen
Oxytocin
Prolatin
FSH

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